android开发之gallery 实现滚动一张且近距离滑动实现滚动

android开发之gallery 实现滚动一张且短距离滑动实现滚动
首先gallery的特点就不用多说了吧，惯性滚动、半屏翻页，但是很多时候我们不需要它的这些特性。我今天就介绍一下 去掉惯性滚动 以及 短距离翻页的实现：
代码先晒出来：
main.xml：

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"    android:orientation="vertical"    android:layout_width="fill_parent"    android:layout_height="fill_parent"    ><com.mh.DetialGallery  android:id="@+id/gallery" android:layout_width="fill_parent"          android:layout_height="fill_parent"  />  </LinearLayout>

DetialGallery 是自己继承的类。

import android.app.Activity;import android.content.Context;import android.os.Bundle;import android.view.View;import android.view.ViewGroup;import android.view.Window;import android.view.WindowManager;import android.widget.BaseAdapter;import android.widget.Gallery;import android.widget.ImageView;public class main extends Activity {    /** Called when the activity is first created. */    @Override    public void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);                requestWindowFeature(Window.FEATURE_NO_TITLE);        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN ,       WindowManager.LayoutParams.FLAG_FULLSCREEN);        setContentView(R.layout.main);        Gallery gallery = (Gallery) findViewById(R.id.gallery);           gallery.setAdapter(new ImageAdapter(this));;      }        private int[] resIds = new int[]            { R.drawable.a1, R.drawable.a2, R.drawable.a3,                      R.drawable.a4, R.drawable.a5, R.drawable.a6,                    R.drawable.a7, R.drawable.a8, R.drawable.a9             };              public class ImageAdapter extends BaseAdapter       {           int mGalleryItemBackground;           private Context mContext;                 public ImageAdapter(Context context)           {               mContext = context;                             }          public int getCount()           {               return resIds.length;           }           public Object getItem(int position)           {               return position;           }                 public long getItemId(int position)           {               return position;           }                   public View getView(int position, View convertView, ViewGroup parent)           {               ImageView imageView = new ImageView(mContext);               imageView.setImageResource(resIds[position]);            imageView.setScaleType(ImageView.ScaleType.FIT_XY);               imageView.setLayoutParams(new Gallery.LayoutParams(480, 800));   //分辨率自己定            return imageView;           }       } }

import android.content.Context;import android.util.AttributeSet;import android.view.KeyEvent;import android.view.MotionEvent;import android.widget.Gallery;public class DetialGallery extends Gallery {    public DetialGallery(Context context ,AttributeSet attrSet) {     super(context,attrSet);     // TODO Auto-generated constructor stub    } private boolean isScrollingLeft(MotionEvent e1, MotionEvent e2)   {       return e2.getX() > e1.getX();    } @Override public boolean onFling(MotionEvent e1, MotionEvent e2, float velocityX,   float velocityY) {  // TODO Auto-generated method stub//  return super.onFling(e1, e2, 0, velocityY);//方法一：只去除翻页惯性//  return false;//方法二：只去除翻页惯性  注：没有被注释掉的代码实现了开始说的2种效果。  int kEvent;    if(isScrollingLeft(e1, e2)){    //Check if scrolling left        kEvent = KeyEvent.KEYCODE_DPAD_LEFT;     }  else{     //Otherwise scrolling right        kEvent = KeyEvent.KEYCODE_DPAD_RIGHT;       }    onKeyDown(kEvent, null);    return true;    } }